otta node problem with nanogateway

I was able to connect my NanoGateway to TTN, then I connected a node and i no had problems, however, now I am having problems to connect the node, when I start the node the following messages appear in the NanoGateway:

I have already been able to connect it, I have disconnected the nanogateway and the node of the power and I have reconnected them again, and they have connected, I would like to know what could be the problem since the frequencies, the message in the nanogateway is